Over-Ear
Haylou S40
68Good
$55
Full review dataHaylou S40 vs Sennheiser HD 400: which should you buy?
On aggregated review scores the Sennheiser HD 400 comes out ahead with an HearWiki score of 82. The full breakdown - sub-scores, specs and what reviewers actually said - is below.
Our pick: Sennheiser HD 400 - Great overall at around $77.
Over-Ear
Sennheiser HD 400
82Great
$77
Full review dataScore breakdown
Each axis is a 0–10 blend of what reviewers scored, not a lab measurement.
Haylou S40
Sound7.0
Noise cancelling6.5
Battery9.0
Value8.0
Sennheiser HD 400
Sound8.5
Value8.0
Specifications
| Spec | Haylou S40 | Sennheiser HD 400 |
|---|---|---|
| Type | Over-Ear | Over-Ear |
| Price (USD) | $55 | $77 |
| HearWiki score | 68 / 100 · Good | 82 / 100 · Great |
| Released | 2025 | - |
| Audio | ||
| Driver | Titanium Drivers | Sennheiser dynamic drivers |
| Driver size | 40 mm | 40 mm |
| Drivers per side | 2 | 1 |
| Frequency response | 20-40000 Hz | 18Hz-20kHz |
| Impedance | 32 Ω | 120 Ω |
| Sensitivity | 97 dB/mW | - |
| Wireless | ||
| Bluetooth | 6 | - |
| Bluetooth version | 6.0 | - |
| Codecs | LDAC, LDHC, AAC | - |
| Multipoint pairing | Yes | No |
| Wireless range | 20 m | - |
| Battery | ||
| Battery life | 90 h | - |
| Battery life (ANC on) | 50 h | - |
| Battery incl. case | 90 h | - |
| Full charge time | 150 min | - |
| Quick charge | not found | - |
| Wireless charging | No | No |
| Features | ||
| Active noise cancelling | Yes | No |
| ANC type | hybrid | - |
| Transparency mode | Yes | - |
| Companion app | Yes | - |
| Custom EQ | Yes | - |
| Wear detection | No | - |
| Controls | buttons | buttons |
| Design | ||
| Weight | 280 g | 240 g |
| Water resistance | None | none |
| USB-C | Yes | Yes |
| Calls | ||
| Microphones | - | 1 |
What reviewers said
Haylou S40
The Haylou S40 is a budget-friendly over-ear wireless headphone that packs impressive features like hybrid ANC, multipoint Bluetooth 6, and support for high-quality LDAC and LDHC codecs. Its standout 90-hour battery life, dual 40mm titanium drivers, and warm, smooth sound make it a compelling pick for everyday listening and commuting. While the build is lightweight and comfortable, the lack of water resistance and reliance on physical buttons may not suit everyone.
- Pro:Exceptional 90-hour battery life
- Pro:Effective hybrid ANC and transparency mode
- Pro:Supports LDAC and LDHC for high-res audio
- Con:No water resistance rating
- Con:Controls are button-based, no touch
- Con:Sensitivity is modest at 97 dB/mW
Sennheiser HD 400
These over-ear Sennheiser headphones are built around a neutral, open-back design aimed at studio work, delivering a wide soundstage and detailed, transparent audio for critical listening. They are lightweight and comfortable for long sessions, with a high-impedance driver setup that helps maintain low distortion, though they lack isolation and come without a carry case. Wired connectivity via USB-C and detachable cables adds versatility, but the open-back nature means sound leaks both ways.
- Pro:Accurate, transparent sound with wide soundstage
- Pro:Lightweight and comfortable for extended wear
- Pro:Detachable cables and USB-C connectivity
- Con:No included carry case or spare ear pads
- Con:Open-back design leaks sound and offers no isolation
- Con:High impedance may require a dedicated amplifier for best results
Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.
Compare something else
Swap either side out, or start again from the picker.